ORCID Profile
0000-0003-2997-0150
Current Organisations
University College London
,
University of Oxford
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Publisher: The Royal Society
Date: 23-12-2019
Publisher: IOP Publishing
Date: 06-11-2020
Publisher: American Physical Society (APS)
Date: 20-04-2021
Publisher: The Royal Society
Date: 24-06-2019
Abstract: In this article, we briefly summarize the experiments performed during the first run of the Advanced Wakefield Experiment, AWAKE, at CERN (European Organization for Nuclear Research). The final goal of AWAKE Run 1 (2013–2018) was to demonstrate that 10–20 MeV electrons can be accelerated to GeV energies in a plasma wakefield driven by a highly relativistic self-modulated proton bunch. We describe the experiment, outline the measurement concept and present first results. Last, we outline our plans for the future. This article is part of the Theo Murphy meeting issue ‘Directions in particle beam-driven plasma wakefield acceleration’.
Publisher: American Physical Society (APS)
Date: 16-07-2021
Publisher: American Physical Society (APS)
Date: 06-01-2021
Publisher: American Physical Society (APS)
Date: 05-01-2021
Publisher: American Physical Society (APS)
Date: 08-02-2019
Publisher: Springer Science and Business Media LLC
Date: 02-03-2022
DOI: 10.1038/S41586-021-04348-8
Abstract: The interaction of intense particle bunches with plasma can give rise to plasma wakes 1,2 capable of sustaining gigavolt-per-metre electric fields 3,4 , which are orders of magnitude higher than provided by state-of-the-art radio-frequency technology 5 . Plasma wakefields can, therefore, strongly accelerate charged particles and offer the opportunity to reach higher particle energies with smaller and hence more widely available accelerator facilities. However, the luminosity and brilliance demands of high-energy physics and photon science require particle bunches to be accelerated at repetition rates of thousands or even millions per second, which are orders of magnitude higher than demonstrated with plasma-wakefield technology 6,7 . Here we investigate the upper limit on repetition rates of beam-driven plasma accelerators by measuring the time it takes for the plasma to recover to its initial state after perturbation by a wakefield. The many-nanosecond-level recovery time measured establishes the in-principle attainability of megahertz rates of acceleration in plasmas. The experimental signatures of the perturbation are well described by simulations of a temporally evolving parabolic ion channel, transferring energy from the collapsing wake to the surrounding media. This result establishes that plasma-wakefield modules could be developed as feasible high-repetition-rate energy boosters at current and future particle-physics and photon-science facilities.
Publisher: American Physical Society (APS)
Date: 10-2021
Publisher: American Physical Society (APS)
Date: 08-02-2019
Publisher: The Royal Society
Date: 24-06-2019
Abstract: The FLASHForward experimental facility is a high-performance test-bed for precision plasma wakefield research, aiming to accelerate high-quality electron beams to GeV-levels in a few centimetres of ionized gas. The plasma is created by ionizing gas in a gas cell either by a high-voltage discharge or a high-intensity laser pulse. The electrons to be accelerated will either be injected internally from the plasma background or externally from the FLASH superconducting RF front end. In both cases, the wakefield will be driven by electron beams provided by the FLASH gun and linac modules operating with a 10 Hz macro-pulse structure, generating 1.25 GeV, 1 nC electron bunches at up to 3 MHz micro-pulse repetition rates. At full capacity, this FLASH bunch-train structure corresponds to 30 kW of average power, orders of magnitude higher than drivers available to other state-of-the-art LWFA and PWFA experiments. This high-power functionality means FLASHForward is the only plasma wakefield facility in the world with the immediate capability to develop, explore and benchmark high-average-power plasma wakefield research essential for next-generation facilities. The operational parameters and technical highlights of the experiment are discussed, as well as the scientific goals and high-average-power outlook. This article is part of the Theo Murphy meeting issue ‘Directions in particle beam-driven plasma wakefield acceleration’.
Publisher: American Physical Society (APS)
Date: 04-08-2020
Publisher: American Physical Society (APS)
Date: 28-12-2020
Publisher: Springer Science and Business Media LLC
Date: 29-08-2018
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for James Chappell.